21345607 has 8 divisors (see below), whose sum is σ = 22589360. Its totient is φ = 20113920.

The previous prime is 21345593. The next prime is 21345619. The reversal of 21345607 is 70654312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21345607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21345637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 757 + ... + 6577.

It is an arithmetic number, because the mean of its divisors is an integer number (2823670).

Almost surely, 2^21345607 is an apocalyptic number.

21345607 is a deficient number, since it is larger than the sum of its proper divisors (1243753).

21345607 is a wasteful number, since it uses less digits than its factorization.

21345607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6033.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 21345607 is about 4620.1306258590. The cubic root of 21345607 is about 277.3976875756.

Adding to 21345607 its reverse (70654312), we get a palindrome (91999919).

It can be divided in two parts, 21345 and 607, that added together give a cube (21952 = 28³).

The spelling of 21345607 in words is "twenty-one million, three hundred forty-five thousand, six hundred seven".